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Imaging the uptake of nitrogen-fixing bacteria into larvae of the coral Acropora millepora

Identifieur interne : 002F07 ( Ncbi/Curation ); précédent : 002F06; suivant : 002F08

Imaging the uptake of nitrogen-fixing bacteria into larvae of the coral Acropora millepora

Auteurs : Kimberley A. Lema [Australie, France] ; Peta L. Clode [Australie] ; Matt R. Kilburn [Australie] ; Ruth Thornton [Australie] ; Bette L. Willis [Australie] ; David G. Bourne [Australie]

Source :

RBID : PMC:4918436

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English descriptors

Abstract

Diazotrophic bacteria are instrumental in generating biologically usable forms of nitrogen by converting abundant dinitrogen gas (N2) into available forms, such as ammonium. Although nitrogen is crucial for coral growth, direct observation of associations between diazotrophs and corals has previously been elusive. We applied fluorescence in situ hybridization (FISH) and nanoscale secondary ion mass spectrometry to observe the uptake of 15N-enriched diazotrophic Vibrio sp. isolated from Acropora millepora into conspecific coral larvae. Incorporation of Vibrio sp. cells was observed in coral larvae after 4-h incubation with enriched bacteria. Uptake was restricted to the aboral epidermis of larvae, where Vibrio cells clustered in elongated aggregations. Other bacterial associates were also observed in epidermal areas in FISH analyses. Although the fate and role of these bacteria requires additional investigation, this study describes a powerful approach to further explore cell associations and nutritional pathways in the early life stages of the coral holobiont.


Url:
DOI: 10.1038/ismej.2015.229
PubMed: 26696324
PubMed Central: 4918436

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PMC:4918436

Le document en format XML

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<p>Diazotrophic bacteria are instrumental in generating biologically usable forms of nitrogen by converting abundant dinitrogen gas (N
<sub>2</sub>
) into available forms, such as ammonium. Although nitrogen is crucial for coral growth, direct observation of associations between diazotrophs and corals has previously been elusive. We applied fluorescence
<italic>in situ</italic>
hybridization (FISH) and nanoscale secondary ion mass spectrometry to observe the uptake of
<sup>15</sup>
N-enriched diazotrophic
<italic>Vibrio</italic>
sp. isolated from
<italic>Acropora millepora</italic>
into conspecific coral larvae. Incorporation of
<italic>Vibrio</italic>
sp. cells was observed in coral larvae after 4-h incubation with enriched bacteria. Uptake was restricted to the aboral epidermis of larvae, where
<italic>Vibrio</italic>
cells clustered in elongated aggregations. Other bacterial associates were also observed in epidermal areas in FISH analyses. Although the fate and role of these bacteria requires additional investigation, this study describes a powerful approach to further explore cell associations and nutritional pathways in the early life stages of the coral holobiont.</p>
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